Bean Bag Filling Calculator
Calculate exactly how many liters or cubic feet of filling you need to revive an old bean bag or stuff a new one.
Find the perfect amount of filling
A bean bag filling calculator estimates the volume of your cover based on its dimensions and shape. It then calculates the optimal amount of beads or foam needed to fill it.
For the best comfort, bean bags should never be filled to 100% capacity. Leaving 20% to 30% empty space allows the filling to move and mold around your body when you sit down.
Use this tool for making DIY bags, topping up flat bean bags, or buying bulk EPS beads, memory foam, or EPP beads.
Recommended Filling Amount
Based on a 75% fill level of a --.
Max Volume (100%)
--
--
Recommended Fill
--
--
Standard 100L Bags
--
Approximate buying guide
Firmness Level
--
Percentage of max volume
Fill Volume Breakdown
Compares maximum capacity against various comfort levels.
| Fill Level | Volume (Liters) | Volume (Cubic Feet) | Use Case |
|---|---|---|---|
| Run the calculator to see fill level options. | |||
Buying tip: Bean bag fill is famously difficult to transfer without spilling. Always buy a little bit more than you strictly need to account for spillage and future settling. Beads will naturally compress over the first few months of use.
How to use the bean bag filling calculator
- Select your shape: Choose the shape that best matches your empty cover. For odd shapes (like teardrops), the classic sphere approximation usually works best.
- Measure the cover: Lay the empty cover completely flat. Measure the longest side (Length), the shorter side (Width), and estimate its maximum expanded thickness (Height).
- Determine firmness: A standard comfortable bean bag is filled to about 75%. If you like sinking deep into it, choose Soft (65%). If you want it rigid like an ottoman, choose Firm (85%).
- New or Top-Up?: If your bean bag is just feeling a little flat but isn't empty, select the "Top-up" option. It calculates roughly 30% of the total volume to revive it.
- Buy your beads: The calculator outputs Liters and Cubic Feet. Most stores sell EPS beans in 100 Liter (approx. 3.5 cubic feet) bags.
Bean bag volume formula
The total amount of filling relies on standard geometric volumetric equations depending on the shape of your cover. Once the base volume is found in cubic inches or centimeters, it is converted to Liters.
A bean bag filling calculator estimates filler volume from bean bag size. Calculate volume with length × width × height for square bags or 4/3 × π × radius³ for round bags. A 3-foot bean bag usually needs 6–8 cubic feet of filling, depending on firmness.
Rectangle Volume = Length × Width × Height
Cylinder Volume = π × Radius² × Height
Required Fill = Total Volume × Firmness Percentage (e.g. 0.75)
Example: A rectangular floor cushion measuring 40" x 30" x 20" has a total maximum volume of 24,000 cubic inches. Converted to liters, this is roughly 393 Liters. To achieve a standard 75% comfort fill, you multiply 393 by 0.75, resulting in about 295 Liters of filling required.
Geometry reference: Khan Academy - Solid Geometry Volume.
Common bean bag sizes chart
This chart provides a quick reference for common commercial bean bag sizes and the typical amount of filling required to achieve standard comfort from completely empty.
| Bag Size Category | Typical Dimensions | Estimated Fill (Liters) | Est. Bags (100L) |
|---|---|---|---|
| Kids / Toddler | 24" diameter | 100 - 150 Liters | 1 - 1.5 bags |
| Standard / Adult | 36" diameter | 250 - 300 Liters | 2.5 - 3 bags |
| Large / Lounger | 48" diameter | 400 - 450 Liters | 4 - 4.5 bags |
| Extra Large Floor Cushion | 55" x 70" (Rectangle) | 450 - 550 Liters | 4.5 - 5.5 bags |
| Giant Sofa Bag | 72" diameter / 6ft | 800 - 1000+ Liters | 8 - 10 bags |
Choosing the right type of filling
The calculated volume will stay mostly the same regardless of what you fill it with, but the material drastically changes the weight, feel, and longevity of the bag.
EPS Beads (Standard)
Expanded Polystyrene. These are the classic, rigid, lightweight white beads. They are affordable and hold shape well, but will compress and go flat after 1-2 years of heavy use.
EPP Beads (Premium)
Expanded Polypropylene. Similar to EPS but highly resilient. They can be crushed and will bounce back to their original size. They last much longer but are more expensive.
Shredded Memory Foam
Extremely comfortable, soft, and will never permanently go flat (just fluff it up). However, foam is very heavy and lacks the fluid "molding" feel of tiny beads.
Microbeads
Tiny sand-like beads used primarily in neck pillows and specialized sensory bean bags. Very heavy in large volumes and a massive mess if the bag tears.
Estimated cost of bean bag filling
Knowing how many liters you need is only half the battle. Bean bag filler prices fluctuate based on material quality, brand, and shipping costs (since the volume is massive). Here is a general estimate of what you can expect to pay per standard 100 Liter bag (approx. 3.5 cubic feet):
| Material Type | Estimated Cost (Per 100L) | Value Proposition |
|---|---|---|
| Standard EPS Beads | $15 - $25 | Cheapest upfront, but requires replacing or topping up every 1-2 years. |
| Shredded Memory Foam | $30 - $45 | Higher upfront cost, but rarely goes permanently flat. Excellent long-term value. |
| Premium EPP Beads | $40 - $60 | Most expensive, but highly durable. Best for outdoor bags and heavy use. |
Note: Buying in bulk (e.g., 400L boxes) usually drops the price per 100L significantly. Check shipping fees carefully, as oversized boxes often incur surcharges.
Eco-friendly & natural filler alternatives
Standard polystyrene (EPS) beads are non-biodegradable and notoriously difficult to recycle. If you are looking for sustainable, plastic-free alternatives to fill your calculated volume, consider these natural options:
Buckwheat Hulls
A traditional, 100% natural filling. They provide incredibly firm, massaging support and allow air to circulate perfectly. Warning: They are extremely heavy. A large bag filled with buckwheat may become too heavy to move easily.
Bio-Foam (PLA)
Made from plant extracts like cornstarch, these beads look and feel exactly like traditional EPS beads but are industrially compostable and CO2 neutral during production. They are an excellent direct replacement.
Upcycled Textiles
The ultimate zero-waste DIY option. You can fill bean bags with old clothing, shredded towels, or discarded stuffed animal stuffing. The bag will feel lumpy and heavier, acting more like a firm floor cushion than a moldable bean bag.
Recycling reference: Earth911 - How to Recycle EPS Foam.
Pro Guide: How to refill a bean bag without the mess
Polystyrene beads are highly susceptible to static electricity. If poured carelessly, they will cling to your clothes, fly across the room, and stick to your walls. Follow the "Paper Tube Method" for a stress-free refill:
Prepare the environment
Turn off all ceiling fans, air conditioners, and close nearby windows. A completely still room is mandatory.
Kill the static electricity
Use a spray bottle to lightly mist the air, the inside of your bean bag, and the plastic bag of refill beads with a tiny amount of water or anti-static laundry spray.
Create a cardboard funnel
Roll a thick piece of stiff paper or cardboard into a tube. Tape it securely. Insert one end deep into the refill bag and zip the bag tight around it. Insert the other end deep into the bean bag cover.
The two-person pour
This is a two-person job. Have one person hold the bean bag cover and funnel steady, while the other person slowly elevates and shakes the bag of refill beads. Pour slowly to avoid air pockets pushing beads back up the tube.
Child Safety Lock: Most modern bean bags have a safety zipper with the pull-tab removed to prevent children from inhaling beads. You will need to slide a paperclip into the zipper head to unlock and pull it open. Remove the paperclip immediately after refilling.
Safety regulations reference: U.S. Consumer Product Safety Commission (CPSC) - Bean Bag Chairs.
Interesting Fact
Did you know that the modern bean bag was invented in 1968 by three Italian designers as a radical "anti-design" experiment called the Sacco chair? What started as a playful counterculture seating statement has since exploded into a massive global industry. According to a market analysis by Dataintelo, the global bean bag market was valued at $4.2 billion in 2025 and is projected to reach an astounding $7.1 billion by 2034. That is a massive volume of EPS beads, memory foam, and eco-friendly filler keeping the world comfortable!
Frequently Asked Questions
Why shouldn't I fill my bean bag to 100%?
A bean bag works by allowing the internal filling to shift away from pressure points and rise up to support your back and sides. If the bag is 100% full, the beads have nowhere to move. Sitting on it will feel like sitting on a tight, hard beach ball, and it increases the risk of bursting the zipper or seams.
How do I know if I only need a "Top-Up"?
Over time, standard EPS beads get crushed by body weight, squeezing the air out of them. If your bean bag looks flat, loose, or you sink too close to the floor, it needs a top-up. A standard top-up usually requires adding about 20% to 30% of the bag's total original volume back into it.
What is the best way to transfer beads without making a mess?
Static electricity causes EPS beads to cling to everything and fly around the room. To prevent this, lightly spray the inside of your empty bean bag cover, and the plastic bag holding the beads, with a tiny mist of water or static guard. Make a funnel out of a rolled-up piece of cardboard, enlist a helper to hold the bag open, and pour slowly.
How many Liters are in a Cubic Foot?
There are approximately 28.3 Liters in one Cubic Foot. Retail bean bag filling is mostly sold in metric Liters internationally, or Cubic Feet in the USA. Our calculator provides both metrics so you can easily shop anywhere.
Can I mix different types of filling together?
Yes! A popular "hybrid" fill mixes 50% standard EPS beads and 50% shredded memory foam. The beads provide structural support and that classic bean bag shape, while the memory foam adds soft, cloud-like comfort and extends the lifespan of the fill since foam doesn't compress as quickly as beads alone.
How long does bean bag filling usually last before going flat?
Standard EPS beads typically last 1 to 3 years before compressing noticeably, depending on how heavily the bean bag is used. Shredded memory foam and premium EPP beads last much longer, often 5 years or more, as they have the ability to bounce back to their original shape after being compressed.
Do I need to remove the filling before washing my bean bag?
Yes, unless your bean bag has a removable outer cover and a separate inner liner that holds the beans. If the beans are loose inside the main cover, you must carefully empty them into large trash bags before washing the fabric. Never put EPS beads or memory foam in a washing machine or dryer.
How do I dispose of old or flattened bean bag filling?
EPS beads are not biodegradable and can be difficult to recycle locally. It is best to check with your local recycling facility to see if they accept expanded polystyrene. Alternatively, you can upcycle the old beads by placing them at the bottom of large planters for lightweight drainage, or use them as packing material for shipping fragile items.
Other useful calculators
Ring Size Calculator
Find ring size from diameter or circumference.
Tie Length Calculator
Choose tie length from height and knot style.
Pleated Skirt Calculator
Estimate pleats, fabric width, and yardage.
Full-Time Equivalent Calculator
Convert work hours into FTE staffing estimates.
Percent to Goal Calculator
Track progress toward a target or project goal.
Calculator Between Two Dates
Find days, weeks, months, and years between dates.
Disclaimer: This bean bag filling calculator provides estimates based on idealized mathematical volume. Real bean bag covers are rarely perfect spheres or precise cylinders, and the fabric stretch can alter volume. Always err on the side of caution by purchasing slightly more fill than the calculation suggests. Standard top-up algorithms use a 30% heuristic which varies depending on how deflated the existing filling is.
Last updated: May 29, 2026